Sapphire vs Kyanite - Photo by Francesco Protopapas
Beryllium treated blue Sapphire - Photo by Francesco Protopapas
Unheated Sapphire vs Heated Sapphire - Photo by Francesco Protopapas
Unheated Sapphire vs Cobalt doped Sapphire - Photo by Francesco Protopapas
Unheated rough Ruby vs Lead glass filled rough Ruby - Photo by Francesco Protopapas

12 Rays black star Sapphire - Photo by Francesco Protopapas
Ancient ring with Simetite Amber - Photo by Francesco Protopapas
Emerald - Natural, Synthetic and Imitations - Part 3/3 - Photo by Francesco Protopapas
Emerald - Natural, Synthetic and Imitations - Part 2/3 - Photo by Francesco Protopapas
Emerald - Natural, Synthetic and Imitations - Part 1/3 - Photo by Francesco Protopapas
Rutile Stars in Quartz - Photo by Francesco Protopapas
Peridot from Pakistan - Photo by Francesco Protopapas
Lead glass filled yellow Sapphire - Photo by Francesco Protopapas
Lead glass filled Ruby - Photo by Francesco Protopapas
Irradiated blu Topaz - Photo by Francesco Protopapas
Enantiornithe feather in Burmite Amber - Photo by Francesco Protopapas
Dumortierite in Quartz - Photo by Francesco Protopapas
Classical Gemological tools - Photo by Francesco Protopapas
Growing Chalcanthite crystals - Photo by Francesco Protopapas
Baltic Amber vs Madagascar Copal - Photo by Francesco Protopapas
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